Spindle holder and method of making same



Aug. 7, 1962 A. CARNITI SPINDLE HOLDER AND METHOD OF MAKING SAME IINVENTOR.

Filed Nov. 24, 1959 llnited dtates This invention relates to spinningmeans for textile spinning and/ or twisting machines, and moreparticularly, it is concerned with the spindle rotatably supportingstructures, namely with spindle holders designed for rotatablysupporting the spindle shaft on the spinning frame.

It is an object of this invention to provide a new and advantageousspindle holder structure which may be manufactured by making use ofeconomically advantageous mass production methods and plants while themost desirable degree of closest standard and uniformity of finishedwork and of precise adjustment and assembling of spindle shaftsupporting components may be ensured.

A more specific object of this invention is to provide a new andimproved spindle holder including a holder body compound structurewherein the prevailing part of the body of substantially tubular shapeis made of pressure die cast aluminum or light metal alloy and havingthe spindle shaft rotatably supporting bearing seat embodied into amachined part of a more hard and stress resisting metal, namely ofhardened steel.

A further object of this invention is to provide, in an improved spindleholder of the above character, a steel made tubular component having abearing seat forming upper enlarged portion integral with a co-axiallower tubular portion, and a light metal pressure die cast holder bodyhaving an open upper end portion and provided with the various flange,screw-threaded and shaped parts and implements required for securing theholder to the spindle frame, and wherein the said tubular comp'onentslower portion is embedded into the upper end portion of said holderbody-whereby the said compound structure is provided with a hard, stressresisting and precision machined component arranged in the structure toform the portion thereof adapted to meet the requirements of precisefitting of the said spindle shaft bearing and stress resistance, whilethe remaining prevailing portions of the structure, which are obviouslynot subject to such requirements, are embodied in a cheaply massmanufacturable component.

Another object of this invention is to provide a new and advantageousmethod for mass producing a spindle holder as above, including the stepsof providing a steel made tubular component fully machined and ground tomeet the requirement of adaptation and precise fitting of the spindleshaft rotatably supporting ball or roller hearing, of locating the saidfinished steel tubular member about a shaped rod into a die, and ofpressure die casting the holder body forming component into said dieabout the said tubular component.

These and other objects and advantages of the invention are in partobvious and in part will be made apparent as this disclosure proceeds,and the features which are believed to be new and characteristics of theinvention will be in particular set forth in the appended claims.

The invention itself, however, both as to its construction and to themethod of carrying out the same, will be best understood from thefollowing detailed description of a preferred form of embodimentthereof, when taken in conjunction with the accompanying drawing,forming an essential component of this disclosure, and wherein: FIGURE 1is a vertical longitudinal sectional view of the inner portion of aconventionally made die wherein the pressure die casting step may beperformed for mass production of the spindle holder of FIGURE 2, whereinthe finished article of manufacture atent is illustrated partly in sideelevation and partly in longitudinal sectional view, in an exploded viewincluding the other spindle assembly components designed to bestructurally connected to said holder; and

FIGURE 3 is partly a side view and partly a sectional vertical view ofthe upper portion of the spindle assembly wherein the components of FIG.2 are shown in their final fitted and connected relationship.

Referring now to the drawing, wherein like reference numerals refer tolike components and parts throughout the several figures, and whereinthe components which are not characteristic of the invention, namely thebearing and the spindle rotatably supported parts, have been illustratedby light drawn lines for best visualization of the structure of theinvention:

According to the method of the invention, the prevailing part of thespindle holder is produced by pressure injecting liquid aluminum orother suitable light metal alloy, say through an inlet passage 1d(FIG. 1) into the cavity 11 of a die 12. The said die 12 isconventtionally produced in two detachable parts and connected to asuitable die casting apparatus (not shown) and, therefore, such meanswhich are typical of manufacture of pressure die castings will notfurther be described as appertaining to current art.

The inner walls of die 12 are shaped to define the outer shape of thearticle of manufacture shown in FIG. 2, except the very upper portionthereof. Therefore in the said die an annular hollow 13 and an upwardlyprojected extension 14 are provided to produce in the pressure diecasting step the flange portion 15 and respectively an upwardly directedbrace 16.

The said brace 16 is designed for pivotally supporting, in the assembledspindle assembly of FIG. 3, by means of a pivot pin 17, a conventionallyconstructed hooking arm 18 adapted to prevent upward movement of thespindle, namely by acting as a stop member above the lower rib or flange19 of the pulley 20 of which a conventionally produced spindle 27 isprovided. Of course the said brace 16 might he therefore differentlyshaped and dimensioned according to the specific shape and arrangementof the rotating parts, according to current art.

The walls of cavity 11 of die '12 are further provided with a innerscrew-threaded portion 21 (FIG. 1) adapted for producing upon the saidpressure die casting step the outer screw-threaded portion 22 (FIG. 2)of the spindle holder body;j such screw-threaded portion is designed forengagement with a nut 23 (FIG. 3) adapted for securing the spindleholder to the spindle textile machine frame, framentarily indicated at24 in FIG. 3, according to a conventional arrangement of parts, thespindle holder abutting from above on said frame 24 and the said 'nut 23co-operating with the lower face 25 (FIG. 2) of the flange portion 15 ofthe spindle holder body. I According to current knowledge of the art towhich this invention appertains, the rotating parts and components of aspindle as indicated at 27 are rotatably supported in the parent spindleholder by means of a hearing as indicated at 26 in FIGS. 2 and 3, saidbearing being of ball or of roller type. The spindle holder must betherefore provided of a seat adapted for fitting the outer ring of suchbearing 26, in the upper portion of the holder. It may be said that theproper service of a spindle assembly is prevailingly dependent from avery precise fitting of such bearing into its seat in the parent holder,and thatthe severe stresses to which the said assembly is subject aretransferred from the rotating parts to said holder at such bearing seat.Therefore the said seat must :be very precisely machined and constructedof a material capable to resist to said stresses. A

On the other hand, it may be said that all remaining parts of the holderdo not have to meet particular rea u? quirements, and, therefore, it isnot worthwhile to produce the whole spindle holder of a material capableof meeting the above requirements confined to the bearing seat.

According to the invention, the compound structure of the spindle holdermay be carried out by locating into the cavity of die 12 a rod 28(FIG. 1) shaped for defining the inner cavity 29 (FIG. 2) of the lowertubular portion 39 of the holder, and by fitting about said rod in saiddie a tubular member 3-1 designed to constitute the stress resisting andbearing seat forming component in the said compound structure.

Such tubular member 31 includes an annular rib 32 at its lower endportion, located in the die 12 substantially at the level of flange 15forming the enlarged portion 13 of the die cavity, and an upper enlargedcup shaped portion 33 wherein the seat 34 (FIG. 2) for the bearing 26 ismade. Such upper portion includes further an upper edge portion 35adapted to be inwardly bent, upon seating of bearing 26 in seat 34, forsecuring said bearing in said seat, as indicated at 35 in FIG. 3.

In the actual manufacture of the spindle holder, upon performance of thepressure die casting step no-substantial further working of the articleis therefore required, except a conventional polishing step, namely bysandblasting, the drilling of a hole for pivot pin 17 and, eventually,the lathe-machining of surface 25 of flange 15 to improve the smoothnessthereof.

It is believed to be evident that the invention provides a new compoundstructure of a spindle holder of the type considered, wherein theportion subject to severe stresses is embodied in a stress resistingmaterial component and wherein the remaining portions not subject toparticular requirements of resistance, hardness and precise workmanshipare on the contrary embodied in a cheaply produced light metal bodywithout prejudicing in any way the service of the device.

It is further believed to be evident that the invention provides a newand advantageous method of manufacture wherein the steps of precisemachining of portions of the spindle holder, namely of the seat for thespindle shaft bearing, may be carried out by machining a relativelysmall sized and circular piece, namely the tubular component 31, andwherein the completely finished component may be positively connected tothe remaining parts of the holder by a successive pressure die castingstep including the forming of the several other features of the article,namely the external and internal shaping of the holder body and theprovision of the external screwthreading required for securing thespindle holder to the textile machine spindle frame.

While the invention has been described and shown but in one form ofembodiment thereof, it is obvious that the invention itself is notlimited to the very details shown, and that several structuralmodifications and variations might be made thereto, according to theart.

It is moreover believed to be evident that the present inventionincludes a plurality of advantageous features, and it will be understoodthat each of the new features described and any combination thereof mayfind useful application in other constructions of spindle holdersdiffering from the ones described.

Without further analysis, the foregoing will so fully reveal the gist ofthis invention that others can, by applying current knowledge, readilyadapt it for various applications without omitting features that, fromthe standpoint of prior art, fairly constitute essential characteristicsof this invention and, therefore such adaptations should and areintended to be comprehended within the spirit and meaning of equivalenceof the invention, as defined in and by the appended claims.

Having thus described the invention and the mode of carrying outthereof, what is claimed as new and desired to have protected by LettersPatent is:

1. A method for making a spindle holder, comprising the stepsofmachining the inner bore of a tubular spindleholding component which hasoutwardly projecting anchoring means and consists of a hard material;placing said spindle-holding component in a die cavity; placing a corerod having an outer surface matching the surface of said bore of saidspindle-holding component in a position passing through said bore andprojecting into said die cavity spaced from the walls of the same;casting a less hard material into said die cavity about said projectingportion of said core rod and about said anchoring means so that thelatter is embedded in said less hard cast material while an inner cavityis formed in said less hard material about said core rod; permittingsaid less hard cast material to solidify so as to form a secondcomponent permanently and integrally connected with said spindleholdingcomponent and having an inner cavity, exactly aligned with said machinedinner bore of said spindleholding component without requiring anassembly and machining operation; and withdrawing said core rod throughsaid bore from said spindle-holding component and from said secondcomponent.

2. The method set forth in claim 1 and including the step of making onsaid spindle-holding component a head portion at one end remote fromsaid anchoring means; and placing said head portion in contact with theinner surface of said die cavity during the casting of said secondcomponent so that the same fills said cavity only to said head portionso that said head portion forms one end portion of the spindle holder.

3. A method as set forth in claim 2, and including the step of machiningsaid bore to a greater diameter in the region of said head portionbefore placing said spindleholding component in said die cavity; andincluding the steps of placing a bearing in said bore portion of widerdiameter, and bending the edge of said head portion inwardly over saidbearing to hold the same in said bore.

4. The method set forth in claim 1 wherein said spindleholding componentis made of a hard metal; and wherein said second component is made of alighter metal.

5. An integral spindle holder comprising a tubular hard-metal componenthaving at one end means for holding a spindle bearing and on the otherend outwardly projecting anchoring means transversely projectingtherefrom, said hard-metal component being provided with a machinedinner borehaving a cylindrical inner surface; and an integral die-castcomponent having an end portion over-lapping said other end of saidhard-metal component with said anchoring means fully embedded in saidend portion of said die-cast component for permanently preventingrelative movement of said components, and an elongated other end portionextending from said hardmetal component and being formed with an innercavity exactly aligned with said machined inner bore of said hard metalcomponent, said inner cavity being provided with an inner cylindricalsurface having the same diameter as said cylindrical inner surface ofsaid bore so as to form a continuation of the same.

References Cited in the file of this patent UNITED STATES PATENTS1,460,515 Selker July 3, 1923 1,494,099 Cole May 13, 1924 1,681,906Taylor Aug. 21, 1928 2,051,641 Magrath Aug. 18, 1936 2,241,118 Cotchetto May 6, 1941 2,485,093 Gelpke Oct. 18, 1949 2,724,945 McGhee a Nov. 29,1955 FOREIGN PATENTS 1,176,426 France Nov. 24, 1958 1,054,887 GermanyApr. 9, 1959

